Belt-gearing.



M. A. BAKER.

BELT GEARING.

APPLICATION FILED OCT. 5, 1908.

Patented May 4, 1909.

PATENT OFFICE MILO A. BAKER, OF LOS .-\NGEIIES, (JALIFORN 1A.

' BE LT- GE ARING.

' Specification of Letters Patent.

Patented May 4, I909.

Application filed October 5, 1908. Serial No. 456,343.

To all whom it may concern:

Be it known that 1, MILO A. BAKER, a citizen of the United States,residing at Los Angeles, in the county of Los Angelcs and State. ofCalifornia, have invented a new and nseful Belt-Gearing, of which thefollowing is a specification. I

The object of the present invention is to provide means for transmittingmotion between two rotary members, for example, the extra bull wheel orcalf wheel and the outer tug wheel on the band wheel shaft of a welldrilling rig. For such purposes a single endless rope or cable isgenerally used, passing over grooved pulleys on the aforesaid wheels,and under the conditions of practice said ro ie has been of such sizethat it'becomes undu y still for easy running. in order to provide theproper strength and tractive power of the rope and at the same timeprovide for liexibility, the rope or cable, according to my invention,is doubled, so that, although it is endless, it presents a double strandthroughout; This necessitates crossing of the two strands at a part ofthe closed circuit, and

the tension of the rope is so maintained that the point of crossing isalways maintained on one run of the combined rope, so that effectivecontact of both strands with the pulleys is always maintained.

The accompanying drawings illustrate the invention: I

Figure 1 is a plan of the two wheels with the cable means connecting thesame. Fig. 2 is a vertical section of one of said wheels with the cablethereon. Fig. 3 is a side ele vation of two wheels and the cable, andFig. 4 is a diagrammatical perspective showing the complete course ofthe cable. Fig. 5 is a side elevation of a portion of the driving wheel.

1 designates a driving wheel which may, for example, as, stated, he theouter tug wheel on the band wlieel shaft 2, of a drilling wheel, and 3re resents the driven member which may be t e calf wheel of the rig,provided with a grooved rim 4 to receive the driving cable 5. 1 Saidcable forms an end less or closed circuit and is doubled so that itprovides a double strand throughout its length, two strands lying sideby side. The

' grooves 6, 7 of the two wheels 1, 3 are of sufficient width to receivethese two strands-side by side and allow each strand to come intoeffective contact with the bottom of the groove for traction thereon. Asthe cable forms a continuous or endless circuit it follows that at somepoint in its course there is a crossing of one strand over the other andthe tension of the rope is such that the pressure of the rope on thewheels forces the two strands to lie fiat, and side by side, againsteach wheel so that thecrossing is prevented from passing onto eitherwheel but remains on the same run in which it was originally formed, thetension on the two strands in advance of the point of crossing causingthe crossing to continually recede along thecable as the cable advancesover the wheeh The two strands of cable run side by side and in contactnot only where they pass around the wheels but throughout the upper andlower runs. The eii'ect of this is to minimize the lateral movement ofthe cable and therefore reduce to a minimum the wear and friction wherethe strands cross one another, as the crossing is eii'e cted simply byone cable rolling over the other instead of by lateral sliding. It isfound that by this construction the loss in friction and the wear andtear on the rope due to bending is considerably less than a cable ofdouble cross section such as would be'necessary to transmit the sameower and the doubled rope being more exible is also easier to put inplace and to handle. This greater flexibility also enables it to workmore freely on the wheels and to take a better grip thereon. One sideflange 6, for example, of the wheel 1, has a notch or cut away portion 8to facilitate insertion and removal of the cable onto or from thewheels. The walls 8 of said slot extend This notch shipping andunshipping means .is of especial advantage in well drilling rigs,

in the connection stated, as it is necessary in such rigs to frequentlychange the belts so as to drive one part or another of the mechanism.

hat I claim is:

1. The combination with two wheels, of a cable connecting the same, saidcable con.

stitutingan endless circuit and being doubled on itself to form twostrands lying side by side and in contact both where they pass aroundthe wheels and in the runs between the wheels, said strands crossing inone run of the cable.

2.. The combination with two wheels having grooves, of a cableconnecting the same, said cable being endless and doubled on itself toform two strandslying side by side in a crossing stituting an endlesscircuit and being doubled on itsel to form two strands lyin side b sideand in contact with one anot er bot Where they pass around the wheelsand in the runs between the wheels, said strands crossing one run of thecable, one of said wheels havin the wall of its groove provided with anote for the purpose stated.

In testimony whereof, Iliave hereunto set 15 my hand at Los Angeles,California, this 28th day of September 1908.

MILO A. BAKER In presence of v FREDERICK S. LYON, FRANK L. A. GRAHAM.

